340's to 350's on the mains?

[grpark20]

Hey guys!! Before I even start I am going to do a plug chop, just curious. Right now all I have is T-5's, K&N filter, 27.5 pilots, and 340 mains with stock carbs at sea level. I have the pro flow adapter with the K&N filter, but I cut off all the airbox around the filter so there is nothing restricting the airflow. I am going to K&N pods, so do you think I'm going to have to rejet? I am thinking yes to the rejet, but at the same time I am going to be adding VF3's, +4 timing, Noss head with 20cc domes, lightened flywheel, and billet impeller. My thought process was that the VF3's will make the difference in added fuel to the added air. So am I way out in left field or what? Also going to run straight race gas and do plug chops and compression checks before I go all out riding. Thanks in advance.

[dajogejr]

Hey guys!! Before I even start I am going to do a plug chop, just curious. Right now all I have is T-5's, K&N filter, 27.5 pilots, and 340 mains with stock carbs at sea level. I have the pro flow adapter with the K&N filter, but I cut off all the airbox around the filter so there is nothing restricting the airflow. I am going to K&N pods, so do you think I'm going to have to rejet? I am thinking yes to the rejet, but at the same time I am going to be adding VF3's, +4 timing, Noss head with 20cc domes, lightened flywheel, and billet impeller. My thought process was that the VF3's will make the difference in added fuel to the added air. So am I way out in left field or what? Also going to run straight race gas and do plug chops and compression checks before I go all out riding. Thanks in advance.

 

 

You should be fine, if not a little rich. I can't say for sure if a single K&N will flow as much as a pair of pods, so...IMO, you're probably a tad rich, but safe.

 

The only thing listed in those mods that effect jetting are the VForce, and normally...IF you have to rejet, it's leaning out the needle one clip. They actually richen up the midrange...so bumping the needle clip one spot towards the blunt end is SOMETIMES, but not always required.

 

You're gonna have a very fun bike once that is all done...but, that's about the limit of bolt ons.

With +4 and 20cc domes, it would be very, VERY wise for you to check compression...you might need a little higher octane than premium pump....

[grpark20]

You should be fine, if not a little rich. I can't say for sure if a single K&N will flow as much as a pair of pods, so...IMO, you're probably a tad rich, but safe.

 

The only thing listed in those mods that effect jetting are the VForce, and normally...IF you have to rejet, it's leaning out the needle one clip. They actually richen up the midrange...so bumping the needle clip one spot towards the blunt end is SOMETIMES, but not always required.

 

You're gonna have a very fun bike once that is all done...but, that's about the limit of bolt ons.

With +4 and 20cc domes, it would be very, VERY wise for you to check compression...you might need a little higher octane than premium pump....

 

Thanks for the info. I plan on running straight race gas. Hopefully I'll be at a minimum of 165psi in each cylinder. I'm goingto do those mods one at a time so if something is out of whack I'll know which mod to concentrate on. With that theory of do a mod then a test run, its going to take 2 days to get her dialed in.... ::

Thanks for the advice though.

[dajogejr]

You're not doing any major work...I'd do it all at once...

 

Take your time putting it all together, and get yourself a tube of high temp RTV.

On the back of the NOSS head, there is the fitting pointing down...it connects a small radiator hose elbow to the W/P.

My advice to you is remove this fitting, put a dab of RTV on this o ring, tighten it.

I always use a thin layer of RTV on all of the orings when i put my cool head on....just to be safe.

 

When you replace the reeds, same thing, skim coat of RTV on both sides of the gaskets.

 

Be careful and set your air gap on the flywheel to .018 or so...set it at +4...and have fun.

 

If it's jetted correctly now, bolt it all together...it should be just fine. If anything, a hair rich in the mid...no biggie.

[grpark20]

You're not doing any major work...I'd do it all at once...

 

Take your time putting it all together, and get yourself a tube of high temp RTV.

On the back of the NOSS head, there is the fitting pointing down...it connects a small radiator hose elbow to the W/P.

My advice to you is remove this fitting, put a dab of RTV on this o ring, tighten it.

I always use a thin layer of RTV on all of the orings when i put my cool head on....just to be safe.

 

When you replace the reeds, same thing, skim coat of RTV on both sides of the gaskets.

 

Be careful and set your air gap on the flywheel to .018 or so...set it at +4...and have fun.

 

If it's jetted correctly now, bolt it all together...it should be just fine. If anything, a hair rich in the mid...no biggie.

 

I'm definately going to take my time. It's just a comfort factor for me to do the mods one at a time and then a test ride or two. I'd hate to have some kind of weird problem and then have to research all the mods to find out what caused it. All in all, thanks for the advice and letting me pick your brain. I'll let you know how it turns out. About 100hrs of riding after this mod is finish, going to get some port work from F.A.S.T. and an aftermarket crank. So should be a fun ride. :biggrin: